public BuildingPart BuildPart(XElement way, bool volume = true)
{
var tags = way.Descendants("tag")
.ToDictionary(
tag => tag.Attribute("k").Value, // add key
tag => tag.Attribute("v").Value); // add value
// Building creation
var buildingPart = new BuildingPart(
tags.ContainsKey("name") ? tags["name"] : "",
Convert.ToInt64(way.Attribute("id").Value));
// Outline construction
// TODO check if closed?
foreach (var elt in way.Descendants("nd"))
{
// find node that matches ways' node ref
var query = (from node in Xdoc.Descendants("node")
where (string)node.Attribute("id") == (string)elt.Attribute("ref")
select node).First();
var pos = Mercator.ToMeters(Convert.ToDouble(query.Attribute("lat").Value), Convert.ToDouble(query.Attribute("lon").Value));
var x = pos.X - Tile.Center.X;
var y = pos.Y - Tile.Center.Y;
buildingPart.Outline.Add(new Vector2(x, y));
}
// Part data
PartData part;
part.volume = volume;
part.height = float.Parse(tags.ContainsKey("height") ? Regex.Match(tags["height"], @"\d+").Value : "-1", CultureInfo.InvariantCulture);
part.min_height = float.Parse(tags.ContainsKey("min_height") ? Regex.Match(tags["min_height"], @"\d+").Value : "-1", CultureInfo.InvariantCulture);
part.levels = Convert.ToInt16(tags.ContainsKey("building:levels") ? tags["building:levels"] : "-1");
part.min_level = Convert.ToInt16(tags.ContainsKey("building:min_level") ? tags["building:min_level"] : "-1");
buildingPart.Data = part;
Surface surf;
surf.colour = tags.ContainsKey("building:colour") ? tags["building:colour"] : "";
surf.material = tags.ContainsKey("building:material") ? tags["building:material"] : "";
buildingPart.PartSurface = surf;
return(buildingPart);
}
/// <summary>
/// Create builidng esh
/// </summary>
/// <param name="building"></param>
/// <returns></returns>
public static Mesh CreateMesh(BuildingPart building)
{
var minY = building.Body.min_height;
var maxY = building.Body.height;
var poly = building.Footprint;
var total = poly.Points.Count;
if (poly is MultiPolygon)
{
(poly as MultiPolygon).Holes.ForEach(x => total += x.Points.Count);
}
// Build mesh
var vertices = new Vector3[total * 2];
var faces = new List <int>();
var colors = Enumerable.Repeat(building.Body.surface.color, total * 2).ToArray();
// Create vertices and polygon for triangulation
var idx = 0;
var P2Tpoints = new List <PolygonPointExt>();
foreach (var point in poly.Points)
{
vertices[idx] = new Vector3(point.X, minY, -point.Y);
vertices[idx + total] = new Vector3(point.X, maxY, -point.Y);
P2Tpoints.Add(new PolygonPointExt(point.X, point.Y, idx++));
}
var P2Tpoly = new Poly2TriPolygon.Polygon(P2Tpoints);
// add faces = 2 triangles
for (var i = 0; i < poly.Points.Count - 1; i++)
{
faces.Add(i + total);
faces.Add(i);
faces.Add(i + 1);
faces.Add(i + total);
faces.Add(i + 1);
faces.Add(i + total + 1);
}
if (poly is MultiPolygon)
{
(poly as MultiPolygon).Holes.ForEach(hole =>
{
// Create holes vertices and holes for triangulation
var P2Thole = new List <PolygonPointExt>();
for (var i = 0; i < hole.Points.Count; i++)
{
vertices[idx + i] = new Vector3(hole.Points[i].X, minY, -hole.Points[i].Y);
vertices[idx + i + total] = new Vector3(hole.Points[i].X, maxY, -hole.Points[i].Y);
P2Thole.Add(new PolygonPointExt(hole.Points[i].X, hole.Points[i].Y, idx + i));
}
// Create holes faces = 2 triangles
for (var i = 0; i < hole.Points.Count - 1; i++)
{
faces.Add(idx + i + total);
faces.Add(idx + i);
faces.Add(idx + i + 1);
faces.Add(idx + i + total);
faces.Add(idx + i + 1);
faces.Add(idx + i + total + 1);
}
P2Tpoly.AddHole(new Poly2TriPolygon.Polygon(P2Thole));
idx += hole.Points.Count;
});
}
try
{
P2T.Triangulate(P2Tpoly);
// Add triangulated top faces
foreach (var tri in P2Tpoly.Triangles)
{
var i0 = tri.Points[0] as PolygonPointExt;
var i1 = tri.Points[1] as PolygonPointExt;
var i2 = tri.Points[2] as PolygonPointExt;
// apply to bottom
// faces.Add(i2.Idx);
// faces.Add(i1.Idx);
// faces.Add(i0.Idx);
// apply to top
faces.Add(i2.Idx + total);
faces.Add(i1.Idx + total);
faces.Add(i0.Idx + total);
// Add roof color
colors[i0.Idx + total] = building.Roof.surface.color;
colors[i2.Idx + total] = building.Roof.surface.color;
colors[i1.Idx + total] = building.Roof.surface.color;
}
return(new Mesh(vertices, faces.ToArray(), colors));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
return(null);
}
